code: def trapezium(self):
      sr = 44100
      frameRate = sr / hopsize  # frames per second
      length = 20  # 20 seconds
      size = int(ceil(length * frameRate))  # size in (hop)frames
      fadelength = int(5.0 * frameRate)  # 5 second aprox
      cutoffHigh = 0.85
      cutoffLow = 0.2
  
      rms = zeros(size)
      for i in range(fadelength):
          rms[i] = 4.0 * i / float(size)
      for i in range(fadelength, size - fadelength):
          rms[i] = 1.0
      for i in range(size - fadelength, size):
          rms[i] = 4.0 * (size - i) / float(size)
      meanRms = mean(rms)
      fadeDetection = FadeDetection(
          frameRate=frameRate,
          cutoffHigh=cutoffHigh,
          cutoffLow=cutoffLow,
      )
      foundFadeIn, foundFadeOut = fadeDetection(rms)
  
      fadeInStop = ceil(fadelength * cutoffHigh * meanRms) / frameRate
      fadeOutStart = length - fadeInStop
      expectedFadeIn = [[0, fadeInStop]]
      expectedFadeOut = [[fadeOutStart, length]]
  
      self.assertAlmostEqualMatrix(foundFadeIn, expectedFadeIn, 1e-3)
      self.assertAlmostEqualMatrix(foundFadeOut, expectedFadeOut, 1e-3)
  
file_path: essentia/test/src/unittests/highlevel/test_fadedetection.py
imports: from numpy import *
  from essentia_test import *
label_desc: Use image node_id 4 for calling the TestFadeDetection obj's underlying member method code with example usage: obj.trapezium() without return types